Selective signaling system.



0. M. LEIGH SELECTIVE SIGNALING SYSTEM.

APPLICATION FILED APR.

1,1 60,294. Patented Nov. 16, 1915.

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sat-scams; swam-line seer-en.

iApplication filediApril 14, 1911. Serial No 620,964.

To all wkomc't may concern: U e v Be it known that I, OSCAR M. Linen, (a citizen of the United States, residing at Genoa, [in the county of De Kalb and State of Illinois, have invented a certain :new and useful lmprovement in Selective Signaling Systems, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming apart of thisspeci-fication.

My invention relates :to harmonic signal receiving devices and is more particularly applicable to those devices which are used for party line service being largely applicable to telephone or similar systems.

My invention herein contemplates the provision of a harmonic signal receiving device of such acharacter that it will be selectively responsive to the polarity of the impressed current iby which I mean that pulsating positive current may operates givenringer, Whereas pulsating negative-current will not, :or vice versa. The ringer is tuned to .a certain frequency so that two ringers zofithe same frequency are made selectively responsive to piilsatory -or vibratory currents of :opposite polarity I My invention contemplates the provision of such a ringer which is polarized and in which the polarizing magnet lisnot included in the magnetic circuit which causes the actuationiofthearmature. This I find 'tofbe necessary :in order to ,prevent ide-magnetization of the permanent magnet, thus t0 provide permanency of the ringer. Ifind it also;necessary to do this in order to obtain a loud signal in order that actuating currents may be used'of considerable strength.

It might also be said that whilea specified ringer is hereinafter referred to the following description, such specific description of the illustration set forth is .merely .illustrative-of one form which invention may take. I am thereby not limiting myself to such specific application. I will however now describe specifically one embodiment of any invention in connection with the accompanying drawing, illustrating the same, in which:

Figure l is a front view-of a specific form ofsignal lreceiving deviceg; Fig. 2 is a side view thereof and Figs; 3 and 4- are details ofconstruotion. r V

.'-I Willmowdescribe a specific ringer construction which I :find gives me the :advantages above referred to. This ringer consists of the ringer spools 1 vand 2 which are unitedjby the heel piece v3, which heel piece carries gong "standards the, and gongs 5; 5. LA permanent magnet -6 is united to the heel piece 13,;and in the ordinary form is bent forwardly at its lowermost extremity as is well understood. Thespools l and 2 are mounted upon )GTOBQS 8, carrying a spring supporting bridge .formedof two parts l 9 between which :a harmonic spring 10 is (placed, the three being riveted together bymeans iof.the-threerivets 11, 1-1, lil; .Nuts 12, 12 hold the bridge on the cores 7 and 8. The spring 10 is likewise riveted to two parts '1-3and 14: forming the armature by means-of theirivets 15. The elements .13 and 1 41 rare of-course of magnetic material, the elements 9., 9 being of non magnetic material asis well understood. The elements 13 and 14; carry upwardly extending :arms 16 which are riveted together with a clapper rod 11' carrying the clapper 18 adapted to agitate the :gongs 5., 5 when currents of the proper (frequency are passed through the ringer-spools to bring thespring 10 into synchronism therewith to thereby vibrate the 'armature lg, 14. v The armature 18,-14 is zed-arranged that it is magnetically unbalanced with respectto the cores Tand 8, and this is done by having :a larger air gap be tween the element l l-and the core so that it will notlbe s ui liciently close to cause the armature to vibrate should currents of a polari-ty which tend only to attract thispor- .tion 14cof the armaturelbe passing through the ringer spools. W

The1ringer spool 2 aids in ;a proper, distribution of anagnetism to direct it toward the armature for the completion of an armple magnetic density as harmonic ringers of this type require a very strong :energization in view of the opposing influence of the Patented Net. 16,, Tera. o

operate.

closed herein but has been canceled from .7 n 1s OI a certain visional application referred to.

ity, and will not respond to currents even if I of the proper frequency but of the opposite predominating polarity. f

By the statement predominating'polarity777 might properly be used there might be a small loop of thatcurrent having the opposite polarity to the main loop, which would however not be sufficient to interfere with 'theselective operation so that the ringer is responsive if the predoininating'polarity It w ll be understood that while I claim this particular construction of ringer tobe novel, yet any form of ringer may be used in connection. with my improved system 'which exhibits simila selective characteristics as the ringer just outlined.

In my co-pending application Serial No.

639,788, filed July 21, 1911, I show asystein with which my ringer may satisfactorily This system was originally disthis application and inserted in the said di- In this divisional application I set forth central station apparatus capable of producing frequencies of 30, 42, 54 and 66, both of negative and positive predominating polarity. I also set forth a substation instrument in which the magneto generator thereat, which is used for calling purposes, impresses current on the line of a polarity to which the generatorson the same line will respond. The various system features have been made the subject matter of the co-pending appli cation above referred to, this application being now confined to the signal receiving device proper and to the claiins'eoveri'ng specifically and generically the particular device capable of selectively responding in answer to predetermined selections of frequency and currents of predominating polarity or other different electrical character. In the claims I use the expression that the armature of the ringer is at all times in closer proximity to one of the two'pole piecesthan the'other. By this I mean that at no time during the oscillation of the armature is the part numbered 14: nearer to its respective pole piece than thepart13 gets away from its associated pole piece. 1

The above descriptionwill illustrate my" I mean that while pulsating current improved device, and may be taken as illustrative of my invention. WVhile I have, however, thus specifically set forth one embodiment of my invention, I do not limit myself to this specific description and arrangement as herein set forth, but 7 Having thus described and shown my invention,what I claim as new and desire to secure by Letters Patent is:

1. A polarized harmonic ringer having two pole pieces andan armature at all times in closer proximity to one pole piece than to the other.

2. A polarized harmonic ringer having two pole pieces and an armature normally within the operative field of one pole piece only. v a y A polarized harmonic'ringer having two pole pieces, an armature at all times in closer proximity to one pole piece than to A the other, a permanent magnet for polarizing said armature, and'a tuned spring upon which said armature is mounted. Y

" L'A polarized harmonic ringer having two pole pieces, an armature normally with .in theoperative field of one pole piece only, a permanent magnet for polarizing said armature, and a tuned spring upon which said armature is mounted. V

5. A polarized harmonic ringer having two pole pieces, an armature at all times in closer proximity to one pole piece'thanto the other, a permanent magnet for polarizing said armature, a tuned spring upon which said armature is mounted, and a winding provided for the pole piece having effective relation with said armature.

- 6. A'polarized harmonic ringer having two pole pieces, an armature normally within the operative field of one pole piece only, a permanent magnet for polarizing said armature, a tuned spring upon which said armature is mounted, and a winding provided for the pole piece having effective relation with said armature.

a 7. A polarized harmonic ringer having a coil; an armature in close proximity tonne extremity of said coil, means for extending the magnetic circuit from the opposite extremityiof said coil toward said armature, normally within the operative field of one pole piece only,'a permanent'magnet for polarizing said armature, and a timed spring upon which said armature is carried;

8. A polarized harmonic ringer having two pole pieces, a winding for one pole piece, and an armature at all times in closer proximity to said last aforesaid pole piece than to the other whereby said'armature responds to current of one direction only.

9. A polarized harmonic ringer having a pair of coils with associated cores and pole pieces, a permanent polarizing magnet, an

armature, a tuned spring on which said that it is not in attractable relation to its armature is mounted, said armature having my name this tenth day of April, A. D., arms extending toward each pole piece, one 1911. of said arms of said armature being bent OSOARM LEIGH away from its corresponding pole piece so Witnesses:

MAX W. ZABEL,

corresponding pole piece.

HAZEL JONES.

In Witness whereof, I hereunto subscribe Copies of this patent may be obtained for five cents each, by addressing" the Commissioner of Patents,

' Washington, D. G. 

